Removal Procedure

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

Drain the cooling system. Cooling System Draining and Filling (Static Fill LWN) , or Cooling System Draining and Filling (GE 47716 LWN) , or Cooling System Draining and Filling (Static LC8, LV1, L96) , or Cooling System Draining and Filling (GE47716 LC8, LV1, L96)
Raise and support the vehicle. Lifting and Jacking the Vehicle
Courtesy of GENERAL MOTORS COMPANY

Auxiliary Heater Outlet Hose Clamp (1) - Remove - Hose Clamp Replacement Guidelines - Spring Type
Auxiliary Heater Inlet Hose Clamp (2) - Remove - Hose Clamp Replacement Guidelines - Spring Type
Auxiliary Heater Inlet Hose (3) - Remove
Auxiliary Heater Outlet Hose (4) - Remove
Auxiliary Heater Nut (5) - Remove [2x]
Clamp (6) - Remove
Lower the vehicle.
Courtesy of GENERAL MOTORS COMPANY

Auxiliary Air Conditioning Air Outlet Duct (2) - Remove - Auxiliary Air Conditioning Air Outlet Duct Replacement (Top Hat Cargo Van C69) , or Auxiliary Air Conditioning Air Outlet Duct Replacement (Rear Pillar Passenger Van)
Courtesy of GENERAL MOTORS COMPANY

Rear Floor Auxiliary Air Outlet Duct (2) - Remove - Rear Floor Auxiliary Air Outlet Duct Replacement (Top Hat Cargo) , or Rear Floor Auxiliary Air Outlet Duct Replacement (Passenger Long Wheel Base Over the Axle) , or Rear Floor Auxiliary Air Outlet Duct Replacement (Front Long Wheel Base Passenger) , or Rear Floor Auxiliary Air Outlet Duct Replacement (Front Short Wheel Base Passenger)
Courtesy of GENERAL MOTORS COMPANY

Auxiliary Heater Bolt (1) - Remove [2x]
Disconnect the electrical connectors.
Courtesy of GENERAL MOTORS COMPANY

Auxiliary Heater (1) - Remove
Transfer components as necessary.